Hi.
I've read everything relevant to this on previous threads, still unable to change my boot sequence.
Need to know how to find the boot entries, how to change default boot, how to save and modify the bootloader after.
Appreciate some instruction at this point. Thanks

the settings of the boot loader (grub2) are saved in /boot/grub2/grub.cfg

If you are logedin as root you are able to edit the settings.
The line set default="0" sets the default boot entry. Zero means the first entry below.
Each block with the word menuentry singes the beginning of a line in the boot menu. Below that, between the {} are the boot options of this line.

Remember that grub.cfg is overwritten whenever you run grub2-mkconfig. To have the default choice remain constant after a grub2-mkconfig, you would edit the /etc/default/grub file. Change the "GRUB_DEFAULT=" line to the OS you would like to set as the default, then regenerate your grub.cfg with grub2-mkconfig:

Code:

grub2-mkconfig -o /boot/grub2/grub.cfg

Note: OS listings start at 0.

Additionally, If you want to change the default on the next boot only, you use the following command, where <OS listing number> is the OS listing number, starting at 0:

[root@localhost ~]# su -c ‘cat /boot/grub2/grub.cfg'
#
# DO NOT EDIT THIS FILE
#
# It is automatically generated by grub2-mkconfig using templates
# from /etc/grub.d and settings from /etc/default/grub
#

### BEGIN /etc/grub.d/40_custom ###
# This file provides an easy way to add custom menu entries. Simply type the
# menu entries you want to add after this comment. Be careful not to change
# the ‘exec tail’ line above.
### END /etc/grub.d/40_custom ###